华北低丘山地不同土地利用条件下的土壤呼吸比较

Abstract

Abstract:

In this study, seasonal variations in soil respiration rate (R_s) in 43-year-old and 10-year-old Robinia pseudoacacia plantations, abandoned land and cropland, and the influence mechanisms were investigated in hilly area of northern China. In 0-5 cm layers, soil organic matter content of 43-year-old and 10-year-old R. pseudoacacia plantations was 3.9 and 1.6 times of cropland, respectively. Annual soil respiration rates of 43-year-old and 10-year-old R. pseudoacacia plantations, abandoned land and cropland were 2.33, 1.21, 2.40, and 2.04 μmol·m^-2 s^-1, respectively. The cropland had the highest annual R_s, and the annual R_s of 43-year-old R. pseudoacacia plantation was significantly higher than that of 10-year-old R. pseudoacacia plantation. Regression analysis showed that soil temperature was the main environmental factor affecting the seasonal variation of R_s. The temperature sensitivity (Q₁₀) of soil respiration was 2.47, 2.53, 2.06, and 1.56 for 43-year-old and 10-year-old R. pseudoacacia plantations, abandoned land, and cropland, respectively. Compared to the cropland, two plantations presented a more temperature sensitivity of soil respiration. Moreover, there was a significant seasonal variation in Q₁₀ in the four land uses, and soil temperature was the key factor that affected the temperature sensitivity of soil respiration. The results indicated that sequestration capacity of soil organic carbon was improved in the two plantations.

Key words: soil respiration, Q₁₀, grain-for-green program, hilly area of northern China

CLC Number:

S718.55

Zhao Na, Meng Ping, Zhang Jinsong, Lu Sen, Cheng Zhiqing. Comparison of Soil Respiration under Various Land Uses in Hilly Area of Northern China[J]. Scientia Silvae Sinicae, 2014, 50(2): 1-7.

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Comparison of Soil Respiration under Various Land Uses in Hilly Area of Northern China

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